Finding the missing length of similar figures

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30

How can you find the mean absolute deviation (mad) for this set of data?

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?